A @ w ‘macxPoor) Preject 11.2 - Sampling - A. }. 7lank P. F. Moore “AY ww ““\ Reape Seven aircraft equipped for cloud sampling es described in the Report were used on this mission: “A° f_ ight, Meer Wiite I (Fai); "BR" flight, Tiger white Il (F-&&); "C* flight, Mger Miue I and I (2-F-4's); "D* Flight, Tiger Yellow I and Il (2-¥-@i'e); and Cassidy D1 (B-57) the control aircraft. WEADER The wind pattern was in general suitable for sampling, with winds blowing from the Kast at velocities up to 17 mots at expected sampling altitudes but with very Little change in direction or velocity, i.e., a favorable wind sheer. Aa sere time approached, Cassidy I] observed a large cumlus cloed strocture running up to about 32,000 feet aitting over ground sero, which could have ces- pletely obscured the bamb cloud for sampling purposes. The 10 mimte delay in shot time allowed a big hole in the cloud eystem to move over ground sere and the bomb slowd went into this bole and remained visible throughout the sampling amdee BEST AVAILABLE COPY PESCHPTL . The bamb cloud rose in an anvil headed column to about 32,000 feet (10,000 ‘fest higher than the prediction) and spread out into the hole in the naturel cloud structure. The top of the bemb cloud penetrated into a selid overcast at 31,000 feet and the bettam of the bomb cloud emerged from the top ef ancther overcast at 15,000 feet. @ Big cumlus colimms were ranked about, joining the undercest ant the oversast and forming a larged closed amphitheatre withia whieh atreraft could fly and still easily see the bomb cleed standing in the middle.